Flue-thimble



(No Model.)

J, P. ADAMS, 'FLUE THIMBLE.

No. 476,111. Patented May 31, 1892.

IN VENTOH A TTOHNEYS W/TNESSES:

THF. Norms harms 120., vuo'rwume. WASFIMSTON, o. c.

NITED STATES JOHN P. ADAMS, OF FARGO, NORTH DAKOTA.

FLUE-THIMBLE.

SPECIFICATION forming part of Letters Patent No. 476,111, dated May 31,1892.

Application filed June 11, 1891. Serial No. 395,962. (No model.)

To all whom it may concern.-

Be it known that I, JOHN P. ADAMS, of Fargo, in the county of (lass andState of North Dakota, have invented a new and improved Flue-Thimble, ofwhich the following is a full, clear, and exact description.

The object of the invention is to provide a new and improvedflue-thimble designed for use on boiler and other fines to stop leaksand which is simple and durable in construction and can be readilyapplied.

The invention consists of a ring having one or more splits extendinglengthwise and Wedges adapted to be driven into the splits to hold thering in place in the fine.

The invention further consists of a hollow mandrel having a yieldingwall.

The invention also consists of certain parts and details andcombinations of the same, as will be fully described hereinafter, andthen pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement as applied, the fine andboiler head being in section. Fig. 2 is a transverse section of the sameon the line new of Fig. 1, and Fig. 3 is a like View of a modified formof the improvement.

The improved flue-thimble is provided with a ring A, adapted to engageat its periphery the flue B and formed with one, two, or more splits 0,extending longitudinally, as is plainly indicated in the drawings. Theseveral splits are adapted to be engaged by wedges D, serving to forcethe ring-sections in firm contact with the inner surface of the flue Band also to hold the ring-sections in place. The opening of the ringA isadapted to be engaged by a mandrel E, preferably made of steel andhollow, so that its wall yields to unevenness in the fines to beoperated on. The ring A is formed on its periphery at the rear edge witha V-shaped annular offset F, adapted to form a bead or shoulder B in theflue B at the inner surface of the boiler-head G. A similar oifset II isformed on the front edge of the ring A and is adapted to form an offsetB on the outer end of the fiue B on the front surface of the boiler-headG.

In order to use this device, the ring A is placed on the small end ofthe mandrel E and is then,witl1 the latter, inserted in the end of theflue B, after which the operator turns and pushes on the mandrel E, sothat the ring is expanded and by its offsets F and H forms the bead Band the annular offset 13 At the same time the operator passes thewedges D into the splits, so that the several sections are forcedtightly in contact with the flue B, at the same time preventing thelatter from being displaced or becoming loose when the mandrel E iswithdrawn. It will be seen that in case of any unevenness in the fine 13the mandrel E, on account of being yielding in its wall, will readilyadapt itself to the unevenness and assume another than a circularcrosssection until the unevenness has been smoothed by the ring comingin contact with the flue. The expansive flue-thimble is preferablydesigned for the use of engineers in charge of the boiler to readilyexpand a leaking flue and to hold the flue in the expanded conditionuntil it is convenient to take the old flue out and insert a new one. Itis understood that the mandrel is withdrawn after the thimble is inplace; but the thimble remains in the flue until the latter is removedand a new flue is inserted.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A flue-thimble comprising a ring having one or moresplits extending lengthwise and wedges driven lengthwise into the saidsplits, substantially as shown and described.

2. In a flue-thimble, the combination, with a ring having one or moresplits extending lengthwise to permit the ring to yield, of a mandreladapted to pass in the said ring and made conical and hollow and formedwith a yielding wall adapted to engage the said ring, substantially asshown and described.

3. In a flue-thimble, the combination, with a ring having splitsextending lengthwise to form sections, of wedges engaging the saidsplits to hold the ring-sections in place in the tube, substantially asshown and described.

4. In a flue-thirnble, the combination, with a ring having splitsextending lengthwise to form sections, of wedges engaging the saidsplits to hold the ring-sections in place in the tube and a hollowconical mandrel having a engaging the said splits to hold the ring inyielding wall and adapted to pass into the place in thetube,substantially as shown and ring, substantially as shown anddescribed. described.

5. In a flue-thiinble, the combination, with JOHN P. ADAMS. 5 a ringhaving longitudinal splits to form sec- Witnesses:

tions and segmental projections formed on the G. H. PHELPS, periphery ofthe said ring-sections,of wedges MILES J. MAHUKEN.

